A Collection of Code Snippets in as Many Programming Languages as Possible
This project is maintained by TheRenegadeCoder
Welcome to the Maximum Subarray in Euphoria page! Here, you'll find the source code for this program as well as a description of how the program works.
include std/io.e
include std/types.e
include std/text.e
include std/get.e as stdget
include std/sequence.e
include std/math.e
include std/mathcons.e
-- Indices for value() return value
enum VALUE_ERROR_CODE, VALUE_VALUE, VALUE_NUM_CHARS_READ
-- Indices for parse_int() return value
enum PARSE_INT_VALID, PARSE_INT_VALUE
function parse_int(sequence s)
-- Trim off whitespace and parse string
s = trim(s)
sequence result = stdget:value(s,, GET_LONG_ANSWER)
-- Error if any errors, value is not an integer, or any leftover characters
boolean valid = (
result[VALUE_ERROR_CODE] = GET_SUCCESS
and integer(result[VALUE_VALUE])
and result[VALUE_NUM_CHARS_READ] = length(s)
)
-- Get value if invalid
integer value = 0
if valid
then
value = result[VALUE_VALUE]
end if
return {valid, value}
end function
-- Indices for parse_int_list() return value
enum PARSE_INT_LIST_VALID, PARSE_INT_LIST_VALUES
function parse_int_list(sequence s)
-- Split string on comma
sequence list = split(s, ",")
-- Parse each item
integer valid = FALSE
sequence values = {}
for n = 1 to length(list)
do
sequence result = parse_int(list[n])
valid = result[PARSE_INT_VALID]
values &= result[PARSE_INT_VALUE]
if not valid
then
exit
end if
end for
return {valid, values}
end function
procedure usage()
puts(STDOUT, "Usage: Please provide a list of integers in the format: \"1, 2, 3, 4, 5\"\n")
abort(0)
end procedure
-- Find maximum subarray using Kadane's algorithm.
-- Source: https://en.wikipedia.org/wiki/Maximum_subarray_problem#No_empty_subarrays_admitted
function maximum_subarray(sequence values)
atom best_sum = MINF
integer current_sum = 0
for k = 1 to length(values)
do
current_sum = values[k] + max({0, current_sum})
best_sum = max({best_sum, current_sum})
end for
return best_sum
end function
-- Check 1st command-line argument
sequence argv = command_line()
if length(argv) < 4 or length(argv[4]) = 0
then
usage()
end if
-- Parse 1st command-line argument
sequence result = parse_int_list(argv[4])
sequence values = result[PARSE_INT_LIST_VALUES]
if not result[PARSE_INT_LIST_VALID]
then
usage()
end if
-- Calculate maximum subarray and display
integer max_value = maximum_subarray(values)
printf(STDOUT, "%d\n", max_value)
Maximum Subarray in Euphoria was written by:
If you see anything you'd like to change or update, please consider contributing.
No 'How to Implement the Solution' section available. Please consider contributing.
No 'How to Run the Solution' section available. Please consider contributing.